Revenue - Summary of Components of Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions	Apr. 30, 2021	Apr. 24, 2020	Apr. 26, 2019
Contract With Customer Liability [Line Items]
Deferred revenue and financed unearned services revenue	$ 4,003	$ 3,698	$ 3,668
Short-term	2,062	1,894
Long-term	1,941	1,804
Deferred product revenue
Contract With Customer Liability [Line Items]
Deferred revenue and financed unearned services revenue	59	75
Deferred services revenue
Contract With Customer Liability [Line Items]
Deferred revenue and financed unearned services revenue	3,873	3,567
Financed unearned services revenue
Contract With Customer Liability [Line Items]
Deferred revenue and financed unearned services revenue	$ 71	$ 56